JP6169540B2 - Deformation detection method for concrete structure using conductive paint protective tape - Google Patents

Description

  The present invention relates to a method for detecting a change in a concrete structure using a conductive paint protective tape, and more particularly to a method for detecting a change in fine cracks in a concrete structure whose surface is covered.

  Conventionally, as a method for detecting deformation of a concrete surface of a structure, an undercoating film (hereinafter referred to as an undercoating material), a conductive coating film (hereinafter referred to as an electroconductive coating) and a protective coating film (hereinafter referred to as an overcoating material) are applied to the concrete surface. A method of detecting a deformation such as a crack by breaking an electric circuit formed by applying (see Patent Document 1 below) is not clear about the crack width that can be detected.

  In addition, the deformation of the concrete surface of the structure is mainly visually inspected using a scaffold or an aerial work platform, and the surface coating method is used for preventive maintenance against deformation such as cracks due to reinforcing steel corrosion. There is.

  FIG. 6 is a conceptual diagram of a conventional crack detection system for a concrete surface, FIG. 6 (a) is a schematic diagram showing details of a conductive paint and a detection circuit, and FIG. 6 (b) is a schematic diagram of a first mode of the detection system. FIG. 6C is a schematic diagram of the second mode of the detection system.

  In FIG. 6A, 111 is an undercoat material, 112 is an intermediate coat material (conductive paint), 113 is an upper coat material, and 114 is a detection device.

  In FIG. 6B, 121 is a reinforced concrete structure, 122 is a conductive paint provided on the surface of the reinforced concrete structure 121, 124 is a detecting device, 125 is a reinforcing bar, 126 is a corrosion product, and 127 is a crack.

  In FIG. 6C, a surface coating 123 is further provided on the surface of the conductive paint 122 in addition to FIG.

  FIG. 7 is a view showing a state of a concrete surface to which a conventional conductive paint is applied.

  In this figure, 131 is concrete, 132 is an undercoat for concrete 131, 134 is an intermediate coat (conductive paint) of application width 133 applied on undercoat 132, and 135 is an overcoat applied on conductive paint 134. Material 136 is a surface coating material.

JP 2006-317350 A

“Fundamental research on detection method of RC corrosion of RC structures using conductive paint”, General Research Institute of Railway Technology, Kentaro Oishi, 4 others, 66th Annual Scientific Lecture Meeting of Japan Society of Civil Engineers (2011), pp . 105-106 “Development of monitoring system for RC structure using conductive paint”, Kentaro Oishi et al., Concrete Engineering Annual Papers, Vol. 34, no. 1, (2012), pp. 1642 to 1647

  As described above, there is an example in which the deformation detection of a structure using a conductive paint is experimentally used for tunnel lining concrete, but the crack width that can be detected is at most about 0.5 to 1.5 mm. However, it did not accurately detect deformations such as cracks caused by corrosion of reinforcing bars on the concrete surface of elevated structures.

  In addition, the application of the conductive paint by brush coating has a lot of unevenness in thickness, and it has been difficult to apply thinly and uniformly.

  Furthermore, when the surface coating method is used after applying the conductive paint, the surface coating material may dissolve the conductive paint and the detection circuit cannot be constructed, or the surface coating material and the conductive paint may adhere to each other, resulting in a decrease in deformation detection accuracy. It was.

  FIG. 8 is a diagram showing a frequency distribution of the detected crack width (brush coating application width 15 mm), FIG. 9 is a diagram showing the frequency distribution of the detection crack width (brush coating application width 10 mm), and FIG. 10 is the detection crack width. It is a figure which shows frequency distribution (brush coating application width 5mm).

  8 to 10, (a) shows no surface coating material, (b) shows a case where surface coating material A (epoxy type) is applied, and (c) shows surface coating material B (cement type). It is a figure which shows the frequency distribution of the detection crack width at the time of being apply | coated.

  As can be seen from these figures, the detection crack width tends to increase when the surface covering material is applied.

  In view of the above situation, the present invention is a modification of a concrete structure using a conductive paint protective tape that can accurately detect fine cracks in a concrete structure even when a surface covering material is applied. An object is to provide a detection method.

In order to achieve the above object, the present invention provides
[1] In a method for detecting the deformation of a concrete structure using a conductive paint protective tape, the surface of the concrete structure has a highly smooth treated surface that does not adhere to the conductive paint on the concrete surface side instead of the top coat of the conductive paint. The opposite side of the concrete surface is electrically conductive by placing a single-sided easy-adhesive film having an easy-adhesion-treated surface that easily adheres to the surface coating material, and a conductive paint protective tape comprising a double-sided tape directly on the conductive paint. The coating material is protected from the solvent of the surface coating material, and the conductive coating material and the surface coating material are cut off.

  [2] In the method for detecting deformation of a concrete structure using the conductive paint protective tape according to [1], the conductive paint is applied by a small-diameter spray gun instead of a brush.

  According to the present invention, instead of a top coat material on the surface of a concrete structure, a conductive paint protection tape comprising a single-sided easy-adhesive film and a double-sided tape is disposed immediately above the conductive paint, thereby protecting the conductive paint from the solvent of the surface coating material. In addition, the conductive paint and the surface coating material can be cut off, and a method for accurately detecting deformation such as fine cracks in the concrete structure due to the conductive paint when the surface coating material is applied can be provided. .

It is the figure which comprised the electric circuit (conductive paint measuring line) by spraying and apply | coating a conductive paint to the lower surface of the ramen viaduct slab which is a concrete structure which shows the Example of this invention. It is a figure which shows the spray application state by the small aperture spray gun instead of the brush which shows the Example of this invention. It is sectional drawing of the electrically conductive paint protective tape for cutting the edge of the electrically conductive paint and surface coating | covering material which show the Example of this invention. It is formation process sectional drawing of the electrically conductive coating material which shows the Example of this invention. It is a figure which shows the frequency distribution (spray application width | variety 2mm or 5mm) of the detection crack width by the deformation | transformation detection method of the concrete structure using the electrically conductive paint protective tape which shows the Example of this invention. It is a conceptual diagram of the conventional crack detection system of the concrete surface. It is a figure which shows the state of the concrete surface which apply | coated the conventional electrically conductive paint. It is a figure which shows the frequency distribution (brush coating application width 15mm) of the conventional detection crack width. It is a figure which shows the frequency distribution (brush coating application width 10mm) of the conventional detection crack width. It is a figure which shows the frequency distribution (brush coating application width 5mm) of the conventional detection crack width.

  The method for detecting deformation of a concrete structure using the conductive paint protective tape of the present invention has a highly smooth treated surface that does not adhere to the conductive paint on the concrete surface side instead of the conductive paint top coat material on the surface of the concrete structure. The opposite side of the concrete surface is electrically conductive by placing a single-sided easy-adhesive film having an easy-adhesion-treated surface that easily adheres to the surface coating material, and a conductive paint protective tape comprising a double-sided tape directly on the conductive paint. The paint is protected from the solvent of the surface coating material, and the conductive coating material and the surface coating material are cut off.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a diagram showing an electric circuit (conductive paint measuring line) formed by spraying and applying a conductive paint to the lower surface of a ramen viaduct slab that is a concrete structure according to an embodiment of the present invention.

  Here, a detection circuit (conductive paint measurement line) 3 is formed on the lower surface 2 of the slab of the reinforced concrete ramen viaduct 1 using conductive paint, terminals are provided at both ends of the detection circuit 3, and a wire is connected to a position accessible from the ground. Alternatively, by wiring wirelessly, it is possible to confirm the presence or absence of deformation at any time without using a scaffold or an aerial work platform.

Here, it is possible to detect the fine pore of Henjo such as cracks by the presence or absence of energization of the sensing circuit 3.

  FIG. 2 is a view showing a spray application state with a small-diameter spray gun instead of a brush showing an embodiment of the present invention. In this embodiment, a conductive paint 13 is applied to the surface of the concrete structure 12 by a small-diameter spray gun 11 instead of a brush.

  FIG. 3 is a cross-sectional view of a conductive paint protective tape for cutting an edge between the conductive paint and the surface coating material according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of the conductive paint forming process.

  In FIG. 3, 20 is formed on the concrete surface side (adhesive surface), 31 is an undercoat applied to the concrete surface side 20, 32 is an intermediate coating material (conductive paint), 33 is a double-sided tape, and 33A is formed on a double-sided tape 33. Slit 34, easy adhesion film 34A, easy adhesion treatment surface (fine irregular surface) formed on the top surface of easy adhesion film 34, 34B highly smooth treatment surface 35 formed on the bottom surface of easy adhesion film 34, 35 Is a surface covering material.

  The coating process of the conductive paint and the surface coating material will be described with reference to FIG.

  FIG. 4A is a cross-sectional view showing a state of the conductive paint protective tape before use, a peelable film 21, a double-sided tape 22 having a slit 22A formed from below, and an easy-adhesion treated surface (fine irregular surface) on the upper surface. An easy-adhesion film 23 having a highly smoothened surface 23B formed on 23A and the lower surface is formed.

  FIG. 4B shows a state in which an undercoat material 31 and an intermediate coat material 32 are applied to the concrete surface side 20.

  Next, as shown in FIG. 4 (c), the release film 21 is peeled off from the state of FIG. 4 (a), and the undercoat material 31 and the intermediate coat material 32 are applied to the concrete surface side (adhesive surface) 20. . Next, an easy-adhesion film 34 having an easy-adhesion-treated surface (fine uneven surface) 34A on the upper surface and a highly smooth-treated surface 34B is pasted on the upper surface through the double-sided tape 33 in which the slits 33A are formed.

  Next, as shown in FIG. 4D, a surface covering material 35 is applied to the entire surface.

  The above-described release film 21 has a thickness of 0.075 mm, the material is polyester, the double-sided tape 33 is a non-woven fabric, the total thickness is 0.16 mm, the adhesive is acrylic, and an easy-adhesion film 34 Is Toyobo Cosmo Shine A4100 (trade name), the thickness is 0.125 mm, and the material can be PET (polyethylene terephthalate).

  According to the present invention, instead of a top coat material on the surface of a concrete structure, a conductive paint protection tape comprising a single-sided easy-adhesive film and a double-sided tape is disposed immediately above the conductive paint, thereby protecting the conductive paint from the solvent of the surface coating material. Then, the conductive paint and the surface coating material were cut off.

  FIG. 5 is a diagram showing a frequency distribution (spraying application width 2 mm or 5 mm) of a detection crack width by a deformation detection method for a concrete structure using a conductive paint protective tape according to an embodiment of the present invention.

  FIGS. 5A to 5B show the frequency distribution of the detection crack width (spray coating width 2 mm or 5 mm). FIG. 5A shows the case where the surface coating material A is present, and FIG. The case where the surface coating material B exists is shown.

  Comparing these figures with the frequency distribution diagrams 8 to 10 according to the conventional method, according to the method of the present invention, it is possible to accurately detect fine cracks even when the surface coating material is applied. I understand.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The method for detecting the deformation of a concrete structure using the conductive paint protective tape of the present invention comprises a surface coating by arranging a conductive paint protective tape comprising a single-sided easy-adhesive film and a double-sided tape directly on the conductive paint instead of the top coat material. It can be used as a method for detecting the deformation of a concrete structure with a conductive paint when a material is applied.

1 Reinforced concrete ramen viaduct 2 Bottom surface of slab 3 Detection circuit (conductive paint line)
11 Small-diameter spray gun 12 Concrete structure 13 Conductive paint 20 Concrete surface side (adhesive surface)
21 Peeling film 22A, 33A Slit 22, 33 Double-sided tape 23A, 34A Easy adhesion treatment surface (fine uneven surface)
23B, 34B Highly smooth surface 23, 34 Easy adhesive film 31 Undercoat material 32 Intermediate material (conductive paint)

Claims (2)

  The surface of the concrete structure has a highly smooth treated surface that does not adhere to the conductive paint on the surface of the concrete instead of the top coat of the conductive paint, and the opposite side of the concrete surface easily adheres to the surface coating material. A conductive paint protective tape consisting of a single-sided easy-adhesive film and a double-sided tape is disposed immediately above the conductive paint, thereby protecting the conductive paint from the solvent of the surface coating material and cutting off the conductive paint and the surface coating material. A method for detecting a deformation of a concrete structure using a conductive paint protective tape.   The method for detecting deformation of a concrete structure using a conductive paint protective tape according to claim 1, wherein the conductive paint is applied by a small-diameter spray gun instead of a brush.

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